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Posted to mapreduce-dev@hadoop.apache.org by Haibo Chen <ha...@cloudera.com> on 2016/03/02 00:47:18 UTC

Question about Retroactive[Failure/Killed]Transition in TaskImpl

Hi All,

I was trying to read TaskImpl.java source code and came across the
RetroactiveFailureTransition and RetroactiveKilledTransition when the Task
is in SUCCEEDED state.

This seems a bit weird to me. How can a task, after it has succeeded,
transition to Failed/Schedule state again. Can anyone shed some light on
what the purpose of these two Retroactive Transitions is?  Thanks a lot in
advance for your explanation.

Best,
Haibo Chen